Alphabet Loses $692 Billion in Market Cap in Three Months as AI Leadership Premium Continues to Fade
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Alphabet has fallen 15% from its May peak, erasing roughly $692 billion in market value. A wave of senior AI departures and delays to its flagship Gemini model are dismantling the AI-leader premium the stock once commanded, while ballooning capital spending deepens investor unease.
$692 billion gone — what happened?
Alphabet shares are down 15% from their May 13 all-time high, making the stock the second-largest drag on the S&P 500 over that span.
This means → the market is repricing Google's "AI front-runner" status. The premium baked into the stock over the past nine to twelve months is being squeezed out.
The turning point came on August 5: AI strategy chief Jeff Dean left to start his own venture, taking several executives with him; DeepMind CEO Demis Hassabis stepped down the same day. The stock shed ~$18.6 billion in a single session.
Why does the talent drain hit Alphabet harder?
Poaching is industry-wide — Meta offered a $200 million multi-year package to lure an AI team lead from Apple; OpenAI attracted over 400 Apple employees.
In plain terms = everyone is losing people, but Alphabet's problem is that the departures struck at the strategic "brain" of its AI effort, not the rank and file.
CFRA research head Angelo Zino put it bluntly: "The key question is, can you monetize AI?" — the talent exodus makes that answer less certain.
Why is the flagship Gemini 3.5 Pro still missing?
Gemini 3.5 Pro — Google's most anticipated next-generation model — is behind schedule, especially in coding capability, the very area where Alphabet is seen as trailing Anthropic and OpenAI.
Two weeks ago Google released Gemini 3.7 Flash but said nothing about a timeline for 3.5 Pro.
This reflects a possible internal dilemma: skip this generation and chase the next one. Markets fear that kind of silence most.
Where is the money coming from? Why does capex unsettle investors?
Alphabet completed a $25 billion bond offering in early August. The company is already in negative free-cash-flow territory, and management has signaled that next year's capex will rise sharply again.
In plain terms = the company is spending more than it earns, borrowing and issuing equity to fund the AI build-out — reported total spending plans reach $205 billion.
Analyst Divyaunsh Divatia was blunt: "The company is financing the AGI race through equity and debt markets, and that makes investors uneasy."
What are the bulls and bears each betting on?
Bulls: Sands Capital's Daniel Pilling argues fresh talent could help — "They have one of the best chips in the world and should be able to succeed." Over the past 12 months Alphabet is still up roughly 65%, outperforming the broader market.
Bears: the AI-leader premium is "fading at the margin." Model delays + talent departures + negative cash flow stack three pressures at once, and patience is thinning.
This means → the next earnings call is the key checkpoint: can Gemini 3.5 Pro get a timeline, and can capex translate into measurable AI revenue? The answers will decide whether the premium rebuilds.
If you are the leader in AI, the market gives you a certain valuation premium — but that premium is fading at the margin.
Divyaunsh Divatia
Analyst, Janus Henderson
(August 2025)
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